Sensitivtiy analysis of input parameters for ingestion pathways in routine releases of radionuclides

The sensitivity analysis of input parameters was performed for an ingestion pathway model in routine releases of radionuclides (U. S. NRC's Regulatory Guide 1.109 model). In this study, three kind s of typical Korean foodstuffs (rice, leafy vegetables, milk) and two kinds of radionuclides (137Cs, 131I) were considered. The values of input parameters were sampled using a Latin hypercube sampling technique based on Monte Carlo approach. The sensitivity indices were quantitatively evaluated using the partial rank correlation coefficients. As the results, the ratio of the interception fraction to the yield of agricultural plants and the human consumption rate were sensitive input parameters for ingestion dose. Additionally, in case of milk, the transfer factor of radionuclides from animal intake to milk and the daily intake rate of feedstuffs were sensitive input parameters. The weathering removal half-life and the delay time from food production to human consumption were relatively sensitive for 137Cs and 131I depositions, respectively